Singer Florence Welch and Dj Calvin Harris have topped the U.K. singles chart for the second time this year (12) with the release of their new track Sweet Nothing.

The pair's first collaboration, Spectrum (Say My Name), reached the number one spot in July (12).

Swedish House Mafia's dance track with John Martin, Don't You Worry Child, fell to second place, Psy's Gangnam Style remained at three, and Diamonds by Rihanna hung on to fourth.

Skyfall, the new James Bond theme song by Adele, who reportedly became a first-time mum last week (begs15Oct12), dropped to fifth.

In the U.K. albums chart, Jake Bugg's eponymous record reigned supreme, bumping Babel by Mumford & Sons to number two.

Leona Lewis' Glassheart entered at three, The 2nd Law by Muse dropped to four, and Rebecca Ferguson's Heaven was at five.